THE NUCLEAR INTERACTION OF ∑ HYPERONS

摘要

The analyses of the strangeness exchange (K~-, π) and the associated production (π~-, K~+) reactions are presented. They indicate — together with the observed properties of ∑ atoms — that the ∑ single particle potential V_∑ is repulsive inside nuclei and has a shallow attractive pocket at the nuclear surface. This conclusion is consistent with the Nijmegen model F of the hyperon-nucleon interaction. It is demonstrated how the strong-interaction shifts and widths measured in ∑ atoms may be used to obtain information on the nucleon density distributions.